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Operating Segments Information - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of operating segments [line items]        
Operating revenue $ 569,997,133 $ 20,547,842 $ 476,978,710 $ 413,182,184
Packaging and EMS segments [member] | Customer One [member]        
Disclosure of operating segments [line items]        
Operating revenue $ 158,624,032 $ 5,718,242 $ 145,952,908 103,987,781
Packaging And Testing segments [member] | Customer Two [member]        
Disclosure of operating segments [line items]        
Operating revenue       $ 44,653,072